Time-harmonic and time-dependent radiation by bifractal dipole arrays

Lakhtakia, Akhlesh; Varadan, Vijay K.; Varadan, Vasundara V.

doi:10.1080/00207218708939187

Cited by 15 publications

(8 citation statements)

References 7 publications

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“…The EM-NF reference data are calculated with the theoretical formulas introduced in (Baum 1971& 1976, Singaraju & Baum 1976. As reviewed by certain research works (Hertz 1892, Chew & Kong 1981, Lakhtakiaa et al 1987, Song & Chen 1993, Jun-Hong et al 1997, Schantz 2001, Selin 2001, Smagin & Mazalov 2005, Sten & Hujanen 2006, Ravelo 2010, the analytical calculation performed with the EM-wave emitted by elementary dipoles allows to realize more practical and more explicit mathematical analyses of the EM-field expressions in different physic areas. We point out that the EM-field emitted by electronic devices can be modelled by the radiations of the optimized combination of elementary EM-dipoles (Fernández-López et al 2009).…”

Section: Outline Of the Presented Chaptermentioning

confidence: 99%

Computation of Transient Near-Field Radiated by Electronic Devices from Frequency Data

Ravelo¹,

Liu²

2012

Fourier Transform Applications

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Section: Outline Of the Presented Chaptermentioning

confidence: 99%

Computation of Transient Near-Field Radiated by Electronic Devices from Frequency Data

Ravelo¹,

Liu²

2012

Fourier Transform Applications

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“…To investigate analytically these types of emissions, the time-domain propagation approach based-on the elementary dipoles radiation is necessary (Song, J. & Chen, K.-M., 1993) (Lakhtakiaa, A., et al, 1987) (Cicchetti, R., 1991). Till now, few relevant models were published in the literature for the fast transient NF emission in time-domain (Shlivinski, A., et al 1997) (Hansen, T. B.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Magnetic Near-Field Radiated by Electronic Devices Disturbed by Transient Signals with Complex Form

Liu¹,

Ravelo²,

Fernandez-Lopez³

2012

APR

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For the safety and reliability of modern hybrid electronic systems in function of the increase of complexity and density integration, relevant modeling methods of near-field (NF) radiation are necessary. This article develops a time-frequency modeling method of electromagnetic (EM) NF emitted by electronic devices excited by transient pulse current. The modeling method is originally flexible to fast switching disturbances propagating in the mixed-systems. The model is based-on the ultra wide band (UWB) model of EM NF maps using a set of elementary EM dipoles. An innovative algorithm for generating a simple reduced model is established. Then, by considering the convolution between the signals exciting the circuit and the UWB model introduced, transient radiation models are realized. The method developed was validated with the magnetic NF radiated at some mm above the microstrip planar DUT. The UWB model effectiveness was verified in RF baseband from DC to 100 MHz. Then, NF map time-dependent model emitted by the circuit excited by a microwave signal modulating 0.9 GHz carrier with 0.6 GHz -1.2 GHz frequency band is also validated. As expected, good agreements between simulations, measurements and the models investigated are observed for any form of excitation current.

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“…Then, the continuation works in the time-domain is introduced in this paper [47]. The considered theory on the transient radiation of dipoles is presented in [49][50][51][52][53][54][55][56][57][58][59][60][61][62]. The principle of this method is mainly based on the plane wave spectrum (PWS) transform associated with the fast Fourier transform as introduced in [63][64][65][66][67][68][69][70][71][72][73][74][75][76][77].…”

Section: Introductionmentioning

confidence: 99%

Application of Near-Field Emission Processing for Microwave Circuits under Ultra-Short Duration Perturbations

Liu

Ravelo

2012

AEM

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This paper deals with the processing method of electromagnetic (EM) near-field (NF) radiated by microwave circuits with transient pulse signals. Two different NF processing methods are proposed by applying the time-frequency approach. First, a computation method of NF/NF transform is presented. This enables to calculate the EM NF maps at different distances from the radiating circuit. The feasibility of NF/NF in both frequency-and time-domain is verified with experimental results. Then, NF processing based on NF emission model implemented in UWB frequency band is also examined in the second part of the paper. For that, the number of EM NF maps representing the large band model is reduced in order to simplify the model based on a set of dipole-array. The timedomain model is implemented by considering the convolution of the transient excitation signals and the UWB dipole-array model. This time-frequency model was validated with a planar microstrip device excited by microwave signal modulating 1.25-GHz-carrier and 0.5-GHz-bandwidth. The methods explored in this paper are particularly useful for the investigation of time-domain emissions for EMC applications by considering transient EM interferences (EMIs).

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Time-harmonic and time-dependent radiation by bifractal dipole arrays

Abstract: The polential utility of fractal concepts in designing antenna arrays is explored. In particular, whereas the time-harmonic far-field response of a bifractal array of hertzian dipolesis also a bifractal, its time-dependent far-field response is shown to be a unifractal.

Cited by 15 publications

References 7 publications

Computation of Transient Near-Field Radiated by Electronic Devices from Frequency Data

Computation of Transient Near-Field Radiated by Electronic Devices from Frequency Data

Modeling of Magnetic Near-Field Radiated by Electronic Devices Disturbed by Transient Signals with Complex Form

Application of Near-Field Emission Processing for Microwave Circuits under Ultra-Short Duration Perturbations

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